Question about Audi A3

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Hi, my 04 audi a3 has a problem with the cooling fan. After driving it does not stop running, i have to disconnect the battery otherwise it runs flat. Please help.

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I have the same problem, it looks like there are no fuses inline with yhe fan unit. You can drive it and disconnect the fans live connection when you stop, which is a little easier and cleaner than disconnecting the battery. I would not recommend running your car without the fans connected. A cylinder head is more expensive than a fan unit. From what i have read on the net, it would seem that the control wiring is built into the twin fan unit. Have you fixed your fan yet ?

Posted on Jul 24, 2009

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Sounds like the relay or the sensor..

Posted on Jul 13, 2009

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1 Answer

Fan runs sometime when the engine is cold and runs down battery


There is a fan switch,,,,sometimes called a sensor which controls the fan....usually located on the back side of the radiator....likely on the left side....about halfway between top and bottom...replace it...Must drain radiator down to that point...Joe LittleBear

Apr 27, 2010 | 2005 Audi A3

1 Answer

Audi a3


Does it keep running till the batt is flat? It could be the aircon condenser fan running - on the left as you stand in front of the car. This is a common prob with A3s of this age.
I have a '05 3.2L Quattro V6 and suffered the same prob. The batt is in the boot of the V6 and is sealed like Fort Knox so impossible to disconnect. After about 3 days with this the fan running constantly and having to put a charger on it every night I let the batt run completely flat to try and reset the complete system - no DIS lights - no starter motor clicks - DEAD. Then I jump started it and the prob disappeared completely. Everything is working perfectly ncluding the aircon. That was 4 days ago and 'touch wood' I've had no probs since. I know this won't work for everyone but it's worth a try before forking out £300+ for a new condenser fan unit. Good luck!

Oct 19, 2009 | 2005 Audi A3

3 Answers

My 2002 audi a3 1.9 tdi is overheating? I have


If your cooling fan is not working you solved your own problem. The cooling fan is what helps your radiator perform its function. The radiator cools down the antifreeze mixture by separating it into small tubes separated by air fins, the fins allow a greater surface area for air. The radiators main function is to dissipate heat into the surrounding atmosphere which it can do well at highway speeds without a fan, but most modern cars need a cooling fan to help pull air across the radiator.
The wiring diagram for your vehicle suggests that there is a 5 amp fuse 4 and a 40 amp fuse 42 that run the radiator fan and control which should be located in an under hood fuse/relay box. Check them with a test light on both sides, with the light to ground you should see a positive voltage at both sides. the 40 amp would most likely be a maxi fuse, or a larger size then the regular atm fuse for the 5 amp,

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2 Answers

After I turn the car off, a fan keeps running. It runs from a few seconds to a minute or two. The temperature gauge does not show the engine over heating.


your car does not have to be overheating for this fan to keep going, it just means that it is hotter than the sensors want it to be and keeps the fan going....it is normal

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3 Answers

03 Audi A4- Coolant fan runs until the battery dies


What does the fan do when you restsrt/charge the battery? Start up again? Replace the sending unit, or unplug the sending unit first. If fan keeps running, the relay is faulty.
if it stops, the sending unit is at faulat. good luck

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1 Answer

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Try diconnecting the two wires on the temp sensor at the bottom of the radiator, you may be able to trace the wires from the fan, it that stops the fan, then replace the sensor and it should be ok

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